I am having a lot of trouble with Windows 7 booting. Here are some details: - single hdd machine (750GB); single partition - Win7 64bit home edition - I am getting the disk boot failure message on boot (nothing in particular changed) - booting from the win CD, repair seems to run ok but does not fix the problem (there are no operating systems listed when I click repair) - have tried running repair several times in succession, but no luck - I HAVE recovered from this problem twice before, using some combination of windows repair and testdisk - testdisk says that the partition table is invalid - have used testdisk to recreate the partition table and rewrite the MBR - when in win recovery, at command prompt, trying to switch to C: drive results in "the device is not ready" - testdisk can find the NTFS partition fine, and all my data files are visible in the testdisk file browser - Oddly, if I boot from a CD into linux (to use testdisk) twice, on the first time repairing the partition table, then on the second time the partition table is STILL broken. - It's as though booting the machine breaks the partition table - could this be a virus? Any help greatly appreciated! Nick.